code: def testEmpty(self):
      # empty array should fail as mean cannot be computed
      self.assertComputeFails(FadeDetection(frameRate=4), ([]))
  
file_path: essentia/test/src/unittests/highlevel/test_fadedetection.py
imports: from numpy import *
  from essentia_test import *
label_desc: Use image node_id 2 for calling the TestFadeDetection obj's underlying member method code with example usage: obj.testEmpty() without return types